[Dust in the Wind]

Yes. From a Bing search. (does hard water decrease the effectiveness of roundup? )

The positively charged cations in hard water bind with the negatively charged glyphosate molecules, resulting in less-effective weed control.

Don't Let Hard Water Make Weeds Hard To Control - USGA www.usga.org/content/usga/home-page/course-care/regional-updates/central-region/2018/don-t-let-hard-water-make-weeds-hard-to-control.html

www.usga.org/content/usga/home-page/course-care/regional-updates/central-re…

How much? Needs more personal research...

[Paul R.]

That would make sense. (Trying to drag back up my old college chemistry classes!)

I wonder how rainwater (naturally soft) may react with glyphosate?

Other info.: http://npic.orst.edu/factsheets/archive/glyphotech.html#:~:text=6-,Water,few%20days%20to%2091%20days.

[Paul R.]

“I wonder how rainwater (naturally soft) may react with glyphosate?”

(My initial web search did not turn up much.)